OASTi;. 'I 1 - >A. 

 r.rtlcmlta.1 * 



Nii..rN On tin- <>th<T hand, lo eleven specimens uf //. MMUeata the amount exposed varlen fr..m 

 fully t.. thir.u i.. iiin.- t.-riths of the width, and ID most CUM weeed* three-fourth*. //. tennttttmn* 

 Safford Is probably nearer than any of the other species, but has constantly a higher spire and narrower 

 uuit.lli.-iiv < m tir exterior of the shell, the lower part ..f th.- outer side of the whorls Is sometimes quite 



pruiiiin.-nt. 



Formatto* and locality. -Stones River group, Minneapolis and St. Paul, Minnesota; Helolt, Janes- 

 Till.- and Mln.-ral Point, Wisconsin, and Dlxon, Dunlelth, La Salle and Kockton, Illinois. Though 

 widely di-trii.ut.-d It seems not to be common at any point. 



CWIsttfcmi. University of Wisconsin ; E. O. Ulrich. 



HKLIOOTOMA VKRTICALIH, n. sp. (Ulrich.) 



I-I.ATB LXII. riO. : PLATE I.XXIV. FIOB. U nd 19. 



This species Is known from casts of the Interior only, but they are readily distinguished from all of 

 ih<- |>r.vi- ling forms by the rectangular form of the outer and upper surfaces of the whorls. The latter 

 are not more than four In number, enlarge rapidly, are strongly convex below and leave a deep and rela- 

 tively narrow umbilicus. On the under side the cast resembles the shell of II. planulatoidcs very 

 closely, but In other respects Is quite different, the outer side of the whorls In that species being concave 

 .iii.l ini-iin.il Inwards above Instead of convex or flat and vertical. Tin- upper surface of the whorls, In 

 accordance with the differences just mentioned. Is considerably wider In //. certiealu. 



Koken figures a Russian shell which he calls Itapkittvma domett (N. Jahrbuch f. Mlneralogie, etc., 

 IflW. Bellageband vl, pi. XI, flgs. 4, 4a) that reminds one greatly of H. vertical**. If be Is right In calling 

 bis species a RofkUama, then It Is evident that It cannot be very closely related to our shell. If, on the 

 other band, It Is, like ours, a Helicotoma, then It might be difficult to distinguish It from the American 

 form. Still, the outer side of the whorls In Koken's species Is not quite vertical, but begins to slope 

 Inward at the upper angle. 



formation and locality. Upper part of Stones River group, High Bridge, Kentucky, where It occurs 

 associated with //. plnnulatoide* and H. granota. 

 CbHedion.-K. O. Ulrich. 



HKLIOOTOMA ORANOSA, n. sp. (Ulrich.) 



PLATE LXXXII. FIO8. U-U. 



\ small, generally 7 to 9 mm. In diameter, probably not exceeding 12 mm; bight equaling about 

 a third of the width; notch-carl oa prominent, thin, its summit carrying a row of small nodes; whorls 

 three and a half or four, the Inner ones raised, the outer two colled nearly In the same plane ; upper sur- 

 face of whorls depressed, nearly flat and sloping slightly downward toward the suture; umbilicus large, 

 exposing about three-fourths of each of the Inner turns ; outer side of whorls strongly convex in the lower 

 half and distinctly concave In th<- upix-r: i-ntlre outer side of whorls, when perfect, covered with Irregu- 

 larly distributed or retrally curved rows of granules or small nodes; a aeries of similar nodes along the 

 ceo' ipper side of the flrat two and a half volutions. 



When the sculpture bearing layer Is removed, the shell Is smooth, and In this condition It is most 

 difficult to distinguish from the young of H. vmbilienta. Perfect specimens, however, with their peculiar 

 granuloM markings, could not possibly be confused with any other species known. 



Formation and locatoy. Upper part of Stones River group, High Bridge, Kentucky. 

 .-E. O. Ulrich. 



